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Cryptocurrency News Articles
SUI Bulls Test Key Resistance — A Breakout Or Rejection Ahead?
Mar 23, 2025 at 11:00 pm
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斯坦福大学医学院的研究人员发现了一种新的机制,通过这种机制,称为microRNA的小RNA分子可以影响基因表达,从而在干细胞中发挥作用。这项研究发表在Nature Communications上,揭示了microRNA在调节干细胞多能性、自我更新和分化中的意外作用。
microRNA是已知通过与称为RISC (RNA Induced Silencing Complex)的蛋白复合体结合来沉默基因的。RISC-microRNA复合体然后识别与其序列互补的靶mRNA分子,导致靶mRNA的降解或翻译受抑。然而,这项研究表明,microRNA还可以通过与RISC蛋白的意外相互作用来影响基因表达。
"我们发现,microRNA可以与RISC蛋白的HAD域发生相互作用,"领导这项研究的斯坦福大学医学院生物化学教授Paul S. Weiss说。"这种相互作用影响了RISC蛋白识别和切割靶mRNA的能力。"
研究人员使用原子力显微镜直接观察到干细胞中存在的microRNA与RISC蛋白的HAD域之间的新相互作用。他们发现,单个microRNA可以同时与多个RISC蛋白相互作用,形成一个蛋白-RNA支架,可以汇集和协调其他蛋白。
"我们推测,这种支架可以充当信号平台,在干细胞中整合和协调多能性网络中的关键转录因子和蛋白,"共同第一作者、斯坦福大学医学院生物化学博士后研究员Ramin Beh '/')sกล่าวได้อย่างน่าทึ่ง แม้จะมีความกังว999
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- Eli Lilly And Co (NYSE: LLY) Stock Prices Soar on Tuesday, April 24th
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